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=20000+8C
We move all terms to the left:
-(20000+8C)=0
We add all the numbers together, and all the variables
-(8C+20000)=0
We get rid of parentheses
-8C-20000=0
We move all terms containing C to the left, all other terms to the right
-8C=20000
C=20000/-8
C=-2500
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